Compressor and pump



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March 13, 1934.

CHARLES W. SIEl/ERT March 13, 1934. c. w. SIEVERT AND PUMP Filed Dec. 18, 1931 4 2 Sheets-Sheet 2 1 VENTOR. CI/AAZES W. SIEl/ER l Www 4/ Patented Mar. 13, 1934 UNETED STATES PATENT GFF'ICE 1 Claim.

The present invention relates broadly to an air compressor and pump.

An object of the invention is to provide a compressor which can be operated at high speeds and which is adapted for use in connection with oil burners, it being designed for large volume rather than high compression.

Another object of the invention is to provide a superior positive pressure blower rather than a fan blower, thereby obtaining a more complete atomization of the oil. It is also adapted for use as a vacuum pump with good efiiciency.

A still further object of the invention is to provide in conjunction with the inlet and outlet means of the device, longitudinal alcoves which may be more convenientlymachined out by means of a rotary tool; the alcove for the inlet means having a throat portion which provides a unique construction for oiling the rotor, and the alcove for the outlet means providing a cushion chamber for the back pressure at the end of the stroke and cooperating in an efficient manner with the floating valve which separates the intake side of the compressor from the discharge side thereof.

Although the foregoing objects and features serve to broadly set forth the basic intent of the invention, still further objects reside in its adaptation for use in connection with portable burners, for conjunction with burners providing heating means for tar kettles, for water heating purposes in washing automobiles, for spraying devices used for spraying walls of houses in their treatment of water proofing, and for other general purposes wherein a complete atomization of a liquid is desired.

Various other objects and features may also more fully hereinafter appear.

An embodiment of this invention is set forth in the accompanying drawings wherein- Fig. 1 is a side elevation of the complete device.

Fig. 2 is a plan view thereof.

Fig. 3 is a left hand end elevation of the device shown in Fig. 1.

Fig. 4 is an enlarged cross sectional view taken on line 4- 1 of Fig. 1; and,

Fig. 5 is a somewhat smaller view showing a longitudinal vertical section taken on line 5-5 of Fig. 4, parts being broken away in order to disclose underlying structure.

The present invention consisting of the compressor (0) includes other major units comprising a motor (M) to operate the compressor and a frame (F) upon which the compressor and motor are mounted.

The frame (F) is constructed in the form. of a tray and is provided with suitable bosses (6), cast integral therewith, whereby the legs of the compressor may be bolted thereto. The compressor is aligned and connected with the motor thru the medium of the coupling (7).

The coupling (7) is of the split type, one half (8) being oounterweighted and fastened to the rotor shaft (9) of the compressor to stabilize the eccentric mounting of the rotor, the other half (10) being fastened to the motor shaft (11). The motor (M) in turn is seated upon the base of the tray to which it is securely fastened.

The entire unit is shown assembled in the first three figures of the drawing. It is portable and may be picked up bodily and carried from place to place.

The motor may be of any conventional type, one preferably designed to operate at above 1759 P. M. so as to deliver a 2 positive pressure the rotor, such a pressure being sufficient 0 meet the present need of the invention.

The present hook-up as shown serves to further explain that the entire unit is very compact. simple easy to assemble.

The compressor unit comprises a body member (12) of somewhat cylindrical shape and end members (13), (13).

The body member is provided with base legs (14), (14) to facilitate its attachments to the frame (F), and the end members are each provided with apertured cars (15), (15), (15), (15) thru which spanner bolts (16) are respectively run, to facilitate attachment of the end members to the body member.

On each end of the body member is provided a circular raised face (17), (1'7) and into each end member is correspondingly formed a circular spline (18), (18) into which said raised face seats, whereby to insure a more perfect air tight interior when these three components parts are assembled.

The body member (12) is provided with a cy indrical chamber (19) running its full length.

Axially of said cylinder and extending into the end members (13), (13) is mounted the rotor shaft (9), there being hubs (20), (20) each integral with said end members in which said shaft is journalled.

On the rotor shaft (9) is mounted the rotor (22) which runs the full length of the cylinder, the ends of the rotor being machined so as to frictionally abut the inside faces of the end members with exact nioety.

The rotor suctionally entrains air into and for cibly expels it from the cylindrical chamber in which it rotates.

The rotor is preferably cast hollow as shown in Fig. 4 to lighten it. Said rotor is eccentrically mounted upon the rotor shaft (9) with which it rotates, so as to have its eccentric face (23) seal at all times with the wall of the chamber (19).

Into the top wall of the body member (12) is drilled a hole (24) which communicates from the outside with the chamber (19), and said hole is tapped part-way for screwing a nipple (25) thereinto. On to the nipple is screwed an oil cup (26), it being the function of the oil cup to lubricate the rotating face of the rotor so as to provide a liquid film seal at the closest point of contact between the face (23) of the rotor and the wall of the cylinder so as to provide a substantially air tight friction seal.

Leading from the exterior wall of the body member (12) and communicating with an alcove or channel (27) in the cylindrical wall, said alcove running the full length of the chamber, are two air intakes (23), (28). Each of said intakes are tapped part-way to accommodate the attachment of a pair of Us (29), (29) having their open ends directed downwardly thru which air is en trained into said cylinder.

Leading tangentially from the chamber (19) to the exterior surface of the body member (12) is a discharge duct (30) said duct also communicating with an alcove (31) extending the full length of the chamber (19). Said duct (30) is also tapped part way to facilitate the attachment of a pipe (32) which connects with an atomizer not shown, said atomizer having been made the basis of an application by me for other letters patent now pending. The alcove 31 is of a cylindrical character and may, therefore, be readily formed by a rotary tool. The throat portion of this alcove extends radially with relation to the compressor chamber.

The alcove 2'? is also of a cylindrical character and may be readily formed by a rotary tool. The cylindrical alcove 27 affords an efficient channel for receiving the fluid entrained thru the plurality of inlet passages 28.

In the crest of the convexity of the alcove 27, the lubricant, from the oil cup 25, drolls down the opposite walls of the alcove in front of the fluid being entrained so that at each revolution of the rotor a portion of its face, as it passes the throat of the alcove, is momentarily lubricated throughout its length, on account of the lubricant crossing the path of the fluid being entrained. An effective viscous seal between the face of the rotor and the wall of the cylinder is thus maintained throughout each revolution made; there being a tapering wall on the side of the alcove opposite the orifices of the intakes against which a portion of the en rained fluid is directed whereby the lubricant is deflected throughout the length of the alcove.

On the opposite side, the alcove 31 acts as a cushion chamber at the end of the stroke to ease off the pressure opposing the rotor as it completes its compression movement.

This pressure relief feature makes it safe to use a relatively thin valve plate 40, with the resulting advantage of less wear upon the periphery of the rotor.

Communicating with said duct (30) is a bore (33) into which is threaded a stem of the pet cock (34) At a point between said alcoves (2'7) and (31) is a recess (35) which runs the full length of the chamber (19) said recess having a throat portion (36).

In said recess is mounted a shaft (3'7). This shaft runs the full length of the cylindrical chamber thru one of the end members (13) to a point therebeyond. In the projecting end of said shaft is mounted a lever pin (38). Said pin at its full extremity having one end of spring (39) fastened thereinto, the other end of said spring being fastened to the end member in such a manner that when the lever pin is rotated in a clockwise are additional tension is stored in said spring.

The function of the spring and lever is to exert a constant counter clockwise pull on the shaft (3'7). The reason for this will now be explained.

Into the shaft (37) between the confines of the interior faces of the end members is fastened one side of a plate (20) which forms a valve. Said valve plate being at all times inclined towards one side of the center of the compressor chamber, the discharge passage of said chamber being located in the portion thereof towards which said valve plate is inclined.

The ends of said valve frictionally abut against the interior faces of the end members, and its floating edge (41) frictionally seals upon the face of the rotor under the action of the spring (39). As the rotor rotates the valve moves thru a differential angle, two positions of which are as shown in full and dotted lines in Fig. 4, the throat (36) being sufficiently wide to accommodate the amplitude of the movement of the valve.

Between the alcove (31) and the recess (35) the wall of the chamber (19) is machined out at (42) so as to permit the eccentric face (23) of the rotor to pass freely by.

As the rotor rotates there is a simultaneous entraining of air thru the intakes (28), (28) and a discharging of air thru the duct (30), the valve (to) acting in the dual capacity of an intake valve and a discharge valve. Its operation is purely mechanical.

I claim;

A compressor provided with a substantially cylindrical chamber, a shaft mounted axially of said chamber, a rotor eccentrically mounted on said shaft and bearing at the side remote from the shaft against the wall of said chamber, said compressor having a cylindrical recess extending longitudinally of the chamber and having a throat communicating with said chamber, said compressor also having an exhaust alcove extending longitudinally of the chamber at one side of and parallel to said recess, and an exhaust pipe leading from said alcove, said chamber having the wall between said alcove and recess forming a plane flat surface, a shaft in said recess, a flat blade having one end fixed to said shaft and having the opposite edge curved toward said rotor and contacting therewith, the width of the fiat portion of said blade being equal to the width of the plane portion of the chamber wall and adapted to be housed against said plane portion in one position of the rotor, the curved edge of the blade serving to close said alcove in said chamber, the edge portion of said blade forming a line contact with the rotor in all positions of the latter, and said flat portion of the blade also forming a tangential line contact with the surface of the rotor as the same approaches said plane surface of the chamber wall, said compressor having an inlet port opening into the chamber on the side of the blade opposite said alcove.

CHARLES W. SIEVERT. 

